“The fact that they were able to get assault weapons — which are not available in France — attack multiple sites, carry it out with perfect synchronization and not be detected shows a level of sophistication that we did not think ISIS had,” Rep. Pete King (R-N.Y.) told the Daily News.

The dragnet has already produced results — 71 suspects have been arrested or charged in ISIS-related cases since 2014, the report says.

But the complexity of the large-scale attack in Paris has rattled anti-terror experts.

“The fact that they were able to get assault weapons — which are not available in France — attack multiple sites, carry it out with perfect synchronization and not be detected shows a level of sophistication that we did not think ISIS had,” Rep. Pete King (R-N.Y.) told the Daily News.

The wannabe jihadists rounded up in the U.S. over the past year were a diverse bunch — Americans, immigrants, even a handful of newly arrived refugees.

There was a pizza delivery guy in Texas, a U.S. Air Force veteran in New Jersey and a homemaker in Virginia.

Six Bosnian immigrants — three naturalized citizens, the others with refugee or legal resident status — were rounded up in February on charges of sending money and military equipment to ISIS fighters abroad.

A portrait has emerged of those most likely to fall under ISIS’ spell.

Most ISIS sympathizers arrested in the U.S. were American citizens in their early 20s, according to a study by the Center on National Security.